SciELO - Scientific Electronic Library Online

vol.27 issue2Effect of temperature and participation of phytochrome on the control of seed germination in Cecropia glaziovi sneth (Cecropiaceae)Effects of the growth regulator and chemical control of diseases on the physiologic and sanitary quality of rice seeds author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Revista Brasileira de Sementes

Print version ISSN 0101-3122


ROSA, Sttela Dellyzete Veiga Franco da et al. Free radical-scavenging enzymes an lea proteins associated to maize seed tolerance to high drying temperature. Rev. bras. sementes [online]. 2005, vol.27, n.2, pp.91-101. ISSN 0101-3122.

Maize seeds assume desiccation tolerance as they dry naturally during maturation and pre drying at 35ºC after their physiological maturity can induce tolerance to artificial drying at 50ºC. Seeds of 'BRS-3060' harvested with 42,2% water content and submitted to increased periods of pre-conditioning, showed enhanced tolerance to 50ºC until 25,9% water content when they reached maximum physiological performance. Seed quality was evaluated by germination and vigor tests and a-amilase enzyme activity. Seeds tolerant and not-tolerant to drying at 50ºC were investigated by means of electrophoretic standards of free radical-scavenging enzymes and lea proteins. The scavenger activity enzyme superoxide dismutase, peroxidase and catalase was detected in 5-day old seedling hypocotyl and lea protein was detected in embryonic axes. The results showed that maize seeds tolerant to 50ºC are associated to catalase enzyme activity but are less related to superoxide dismutase and peroxidase enzymes activities. Lea proteins were not present in maize seeds non tolerant to desiccation and their presence was associated to the physiological performance of tolerant seeds.

Keywords : Zea mays; desiccation tolerance; peroxidase; superoxidase; catalase.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License